scholarly journals A mathematical model of the current density distribution in electrochemical cells

2011 ◽  
Vol 76 (6) ◽  
pp. 805-822 ◽  
Author(s):  
Konstantin Popov ◽  
Predrag Zivkovic ◽  
Nebojsa Nikolic
Keyword(s):  
Mathematical Model ◽  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Current Density Distribution ◽  
Theoretical Explanation ◽  
Electrochemical Kinetics ◽  
Complete Analysis ◽  
Electrochemical Cells ◽  
Corner Effects

An approach based on the equations of electrochemical kinetics for the estimation of the current density distribution in electrochemical cells is presented. This approach was employed for a theoretical explanation of the phenomena of the edge and corner effects. The effects of the geometry of the system, the kinetic parameters of the cathode reactions and the resistivity of the solution are also discussed. A procedure for a complete analysis of the current distribution in electrochemical cells is presented.

Experiment Study on the Current Density Distribution of PEMFC by Segmented Cell Technology

2020 ◽  
Author(s):  
Tianwei Miao ◽  
Xu Xie ◽  
Chasen Tongsh ◽  
Jinqiao Liang ◽  
Yiqi Liang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Current Density Distribution ◽  
Cold Start ◽  
Proton Exchange ◽  
Cell Technology ◽  
Segmented Cell

Abstract The homogeneous of current density distribution is very important for performance and lifetime of proton exchange membrane fuel cell. In this study the current density distribution of a fuel cell with an active area of 108 cm2 has been investigated by using segmented cell technology. The σc is introduced to evaluate the homogeneity of current density and the smaller value of σc represents better homogeneity of current distribution. Under normal conditions, the experimental results show that the current density decreases progressively along the flow field at low cathode stoichiometry. It is also found that the homogeneity of current distribution has a strong correlation with the membrane hydration condition and always performs best at cathode relative humidity of 80% when anode condition keeps constant. The value of σc can be significantly reduced when cathode stoichiometry increases from 1.5 to 2.5, but it changes little when cathode stoichiometry continues to increase. During the cold start process, the evolutions of current density distribution are consistent with the temperature mappings. The form of stabilized heat core in the middle regions and homogeneous current density distribution are necessary for successful cold start. The value of σc also can be used to evaluate that the cold start succeeds or not.

scholarly journals Current Density Distribution in Electrochemical Cells with Small Cell Heights and Coplanar Thin Electrodes as Used in ec-S/TEM Cell Geometries

2019 ◽  
Vol 166 (4) ◽  
pp. H126-H134 ◽  
Author(s):  
Elizabeth A. Stricker ◽  
Xinyou Ke ◽  
Jesse S. Wainright ◽  
Raymond R. Unocic ◽  
Robert F. Savinell
Keyword(s):  
Density Distribution ◽  
Current Density ◽  
Current Density Distribution ◽  
Small Cell ◽  
Electrochemical Cells ◽  
Tem Cell

scholarly journals The effect of electrodeposition process parameters on the current density distribution in an electrochemical cell

2001 ◽  
Vol 66 (2) ◽  
pp. 131-137
Author(s):  
K.I. Popov ◽  
R.M. Stevanovic ◽  
P.M. Zivkovic
Keyword(s):  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Electrochemical Cell ◽  
Common Knowledge ◽  
Cell Voltage ◽  
Current Density Distribution ◽  
Deposition Process ◽  
Exchange Current ◽  
Diffusion Control

Cell voltage - current density dependences for a model electrochemical cell of fixed geometry were calculated for different electrolyte conductivities, Tafel slopes and cathodic exchange current densities. The ratio between the current density at the part of the cathode nearest to the anode and the one furthest away were taken as a measure for the estimation of the current density distribution. The calculations reveal that increasing the conductivity of the electrolyte, as well as increasing the cathodic Tafel slope should both improve the current density distribution. Also, the distribution should be better under total activation control or total diffusion control rather than at mixed activation- diffusion-Ohmic control of the deposition process. On the contrary, changes in the exchange current density should not affect it. These results, being in agreement with common knowledge about the influence of different parameters on the current distribution in an electrochemical cell, demonstrate that a quick estimation of the current distribution can be performed by a simple comparison of the current density at the point of the cathode closest to anode with that at furthest point.

scholarly journals A new current line division concept for the determination of the current distribution in electrochemical cells. Part I: Theoretical background of the “corner weakness” effect in electroforming

2000 ◽  
Vol 65 (12) ◽  
pp. 905-914 ◽  
Author(s):  
K.I. Popov ◽  
R.M. Stevanovic
Keyword(s):  
Current Distribution ◽  
Deposition Process ◽  
Theoretical Background ◽  
Theoretical Explanation ◽  
Electrochemical Kinetics ◽  
Electrochemical Cells ◽  
Current Line ◽  
New Approach ◽  
Basic Equations

A new approach to the determination of the current distribution in electrochemical cells, the current line division concept, is introduced. The new concept, based on the basic equations of electrics and electrochemical kinetics, was employed for a theoretical explanation of the phenomenon known in electroforming as ?corner weakness?. It was shown that this phenomenon depends on the kind of control of the deposition process, being the largest in the case of pure ohmic control and disappearing in the case of pure activation control.

scholarly journals The current distribution in an electrochemical cell. Part VI: The quantitative treatment for cells with three plane parallel electrode arrangements

2001 ◽  
Vol 66 (7) ◽  
pp. 491-498 ◽  
Author(s):  
K.I. Popov ◽  
S.M. Pesic ◽  
P.M. Zivkovic
Keyword(s):  
Quantitative Determination ◽  
Density Distribution ◽  
Current Distribution ◽  
Current Density ◽  
Electrochemical Cell ◽  
Current Density Distribution ◽  
Plane Parallel ◽  
Parallel Electrode ◽  
Quantitative Treatment

Amethod for the quantitative determination of the current density distribuion in cells with a three plane parallel electrode arrangement is proposed. It is shown that the current density distribution can be determined using the data obtained by simple polarization measurements. The relation to the Haring-Blum cell with P = 2 is discussed.

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